Shi-Jin Feng's research while affiliated with Tongji University and other places
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Publications (7)
As a highly oxidizing ion, ammonium (NH4⁺) is easily reduced by other reducing substances. Recently, NH4⁺ oxidation coupled to Fe³⁺, SO4²⁻, and Mn⁴⁺ reduction, i.e., Feammox, Sulfammox, and Mnammox, have been confirmed and their collaborative roles in removing NH4⁺ have been revealed in several studies. However, only limited knowledge on observed i...
Displacement back analysis is often performed to estimate rock parameters in tunnel construction. However, most researchers use the final values of monitoring displacement without considering the loss involved and the space effect, causing substantial errors. In this study, a displacement-based back analysis method is developed for estimating rock...
Landfill has become one of the main atmosphere methane sources. Biocover systems were proposed to mitigate methane emission by utilizing the biodegradation existing in landfill cover soils. The methane emission from landfill should be estimated by considering the methane oxidation and migration process in the biocover system. For the typical biocov...
Considering exponential decreases in landfill gas (LFG) generation and gas permeability of waste with depth, a design method for vertical gas well spacing to achieve a 90% recovery rate is proposed through a quantitative analysis of over 500,000 scenarios calculated using a normalized analytical solution. Both increasing cover resistance and pump c...
Flow slide is a form of landslide that can pose a great threat to the surrounding population and buildings. The collapse of buildings is an important cause of injury and death, so it is highly important to understand the failure process of buildings under the impact of flow slide and put forward effective methods for the hazard mitigation. In this...
Aeration is an effective method to repair old landfills and reduce the post-closure charge. Before designing the aeration systems, reliable prediction of aeration systems performance is important because operators could optimize the system based on it. This study proposes a three-dimensional CFD model of vertical aeration systems using ANSYS Fluent...
Internal shear strength of geosynthetic clay liner (GCL) is of vital importance for the stability of waste containment facilities where GCLs are widely used as hydraulic barriers. This paper presents an experimental investigation of the internal shear strength of hydrated needle-punched geosynthetic clay liners (NP GCLs) under monotonic loading. A...
Citations
... Furthermore, the mechanical parameters of the supporting structures are shown in Table 1. Based on the field measured data, the particle swarm optimization (PSO) algorithm is used for parameter inversion to obtain the surrounding rock creep damage parameters, as shown in Table 2 [37]. The in situ stress field of the model is restored according to the measured in situ stress. ...
... Further, truncation errors and numerical dispersion can be avoided by using analytical solutions because they are generally derived from basic physical principles. In the analytical model, transport mechanism including diffusion, advection, adsorption and degradation are usually considered (Yao et al., 2015;Shi et al., 2016;Xie et al., 2016Xie et al., , 2017Xie et al., , 2018Feng et al., 2018Feng et al., , 2019. Analytical models are usually developed by combining mass conservation equation with Fick's law and Darcy's law. ...
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... The following assumptions are formulated: the flow is considered single-phase, the process of dispersion of COX pollution in the atmosphere is taken into account. Figures 1 and 2 show the boundary conditions for the domains [5,6]. When forming a physical model, the effect of gravity was not taken into account as an accepted assumption. ...
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... Other numerical approaches such as cohesive element method (CEM) [48,61], smoothed-particle hydrodynamics (SPH) [62,63] and finite particle method (FPM) [64] are very rarely used for collapse analysis of the structures. Due to lack of reliable literature, these method are excluded from further review and in the next sections emphasis is put on FEM, AEM and DEM as the three powerful approaches for progressive collapse analysis. ...
